Force based layout

I played a bit with this code and I I understand that:

when I decrease the charge - elements move apart;

when I increase the strength - elements move closer to each other;

 but I don’t understand why when I increase the length - the graph begins to curl.

Can you explain this to me please?

Best regards,

Natalia

On Nov 11, 2014, at 4:27 PM, Natalia Tymchuk <[hidden email]> wrote:

Thank you. 

Best regards,

Natalia

On Nov 11, 2014, at 3:02 PM, Alexandre Bergel <[hidden email]> wrote:

As Nicolai said, you need to explicitly say that you want the edges to be considered in the layout using #useInLayout.

Additionally, you may want to play with the charge and length in the layout. Consider the following example:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

builder := RTGraphBuilder new.

builder nodes shape: (RTEllipse new size: 20).

builder edges

connectTo: [ :c | c subclasses ];

useInLayout;

shape: (RTLine new color: Color gray).

builder layout force

charge: -300;

length: 20.

builder addAll: Boolean allSuperclasses, Boolean withAllSubclasses.

builder build.

builder view

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

We give a repulsion of -300 to each node (which is what you want since nodes have to repulse each other), and you give a length of 20 pixel to each edge.

You end up with something like:

<Screen Shot 2014-11-11 at 11.01.43 AM.png>

Cheers,

Alexandre

-- 
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel  http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

On Nov 10, 2014, at 8:17 AM, Natalia Tymchuk <[hidden email]> wrote:

Hello.

I’m trying to use Force based layout to position some elements. I expected to get the image like this.

<Screen Shot 2014-11-10 at 11.16.54.png>

Using this code http://ws.stfx.eu/LACEUL5X6K1S  I got something different and I don’t know why. 

 <Screen Shot 2014-11-10 at 12.01.11 PM.png>

It looks like all elements attract instead of repel each other. Does somebody know why it is like that?

Best regards,

Natalia

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